General Information


Cobra Herbicide is a selective, broad spectrum herbicide for preemergence and postemergence control of susceptible broadleaf weeds. Cobra Herbicide is formulated as an emulsifiable concentrate containing 2 lbs of active ingredient per gallon. In the Midwest, postemergence application of Cobra Herbicide to soybeans (at or just before 1st bloom) has resulted in suppression of the soybean disease white mold caused by Sclerotinia sclerotiorum. Cobra Herbicide works primarily through contact action. Good coverage of young, actively growing weeds is essential for maximum weed control. The use of a spray adjuvant is usually required. Refer to the label section on ADJUVANTS AND ADDITIVES for specific recommendations.

When Cobra Herbicide is applied postemergence, a portion of the spray solution may contact the soil surface. If soil moisture conditions are favorable for preemergence activity following the application, suppressed germination of small-seeded broadleaf weeds, such as nightshade and pigweed species (including waterhemp and Palmer amaranth) may be expected for a 2 week period with rates of 10 fl oz/A or greater. The presence of excessive crop or weed foliage at the time of application will reduce the amount of herbicide spray contacting the soil surface
and will reduce the level of soil activity.

A temporary crop response should be expected following a postemergence application of Cobra Herbicide. Leaves which are open at the time of application will show some burn, bronzing and speckling. Leaves which have emerged but are unopened at the time of application may appear cupped at the tip and/or crinkled along the edges of the leaf. Labeled crops quickly outgrow all initial herbicide effects. When Cobra Herbicide is used as directed yields will not be adversely affected.


Do not apply this product through any type of irrigation system. Do not make more than two applications per acre per season.


For best results, apply Cobra Herbicide to actively growing weeds within the growth stages indicated in this label. Applying Cobra Herbicide under conditions that do not promote active weed growth will reduce herbicide effectiveness. Do not apply Cobra Herbicide when the crop or weeds are under stress due to drought, excessive water, extremes in temperature, disease or low humidity. Weeds under stress tend to become less susceptible to herbicidal action. Cobra Herbicide is most effective when applied under sunny conditions at temperatures above 70°F.


Cobra Herbicide is rainfast 30 minutes after application. Do not apply Cobra Herbicide if rain is expected within 30 minutes of application or efficacy may be reduced.


The addition of an adjuvant to Cobra Herbicide is required for postemergence weed control. Use of a crop oil concentrate (COC), including methylated seed oils (MSO), containing at least 15% emulsifier or non-ionic surfactant containing at least 80% surfactant is recommended. The addition of nitrogen (28, 30 or 32%) or ammonium sulfate, in combination with COC or non-ionic surfactant, may enhance weed control. Mixing and compatibility qualities should be verified by a jar test.

Crop Oil Concentrate: Crop oil concentrate is the preferred adjuvant with Cobra Herbicide for weed control over a wide spectrum of application conditions. Higher levels of crop response are also generally observed with the use of a crop oil concentrate; however crops quickly outgrow all initial herbicide effects. The rate of crop oil concentrate will depend on the environmental conditions preceding the application and the weed size and species at the time of application. If environmental conditions are good and weeds are growing vigorously, use of the low rate of crop oil concentrate is recommended. The higher rate is required when the weeds are under environmental stress such as low temperature, low humidity or low soil moisture.

Non-Ionic Surfactant (NIS): Under optimal growing conditions, and when weeds are actively growing, a NIS may be used in place of a crop oil concentrate.

Drift Control Additives
Drift control additives are not recommended with Cobra Herbicide.
Refer to crop specific directions for adjuvant recommendations.


Application equipment should be clean and in good repair. Space nozzles uniformly on boom and frequently check for accuracy. Ground speed should not exceed 10 mph to provide proper spray coverage. Boom height, ground speed, and pressure recommendations, should not exceed those recommended by the spray nozzle manufacturer for the type and size of nozzle being used. Improper use of the selected spray nozzle will adversely affect the spray pattern, prevent proper coverage of weed leaf surface, and reduce weed control. Refer to the manufacturer’s spray chart for nozzle selection and operating information. Give special attention to preparing and operating the spray equipment to assure proper coverage of weed foliage.


Do not allow spray from ground or aerial equipment to drift onto adjacent land or crops. The interaction of many equipment and weather related factors determine the potential for spray drift. The applicator and the grower are responsible for considering all factors involved in minimizing drift potential.


Do Not Use The Following Delivery Systems To Apply Cobra Herbicide:
1 – Flood nozzles
2 – Control Droplet Application (CDA)
3 – Flat fan nozzles larger than 8006
4 – Spray rigs which utilize wheel driven pumps

Apply Cobra Herbicide and Cobra Herbicide tank mixes with ground equipment using standard commercial sprayers equipped with flat fan (including split-nozzle systems which spray in opposite directions) or hollow cone nozzles designed to deliver the desired spray pressure and spray volume. Thorough weed coverage is required for optimum control. Center spray nozzles at a maximum of 20 inch spacing to provide adequate coverage.

Carrier Volume and Spray Pressure

Use Cobra Herbicide on a broadcast basis in a minimum of 10 gallons of water per acre and a minimum spray pressure of 40 PSI measured at the boom. Cobra Herbicide is a contact herbicide which requires coverage for optimal control. Valent recommends 20 gallons of water per acre when targeting weeds which are at the maximum labeled growth stage at application.


Spray drift away from the site of application may cause damage to non-target vegetation. To minimize drift, apply the largest droplet size consistent with uniform coverage and satisfactory weed control. To obtain satisfactory application and avoid drift, the following directions must be observed:

- Do not apply during low-level inversion conditions (including fog), when winds are gusty or under other conditions that favor drift. Do not spray when wind velocity is less than 2 mph or more than 10 mph.

- Do not apply this product by air within 200 ft of nontarget plants including non-target crops.

- Do not apply this product by air within 200 ft of emerged cotton crops.

- Do not apply this product by air within 200 ft of streams, wetlands, marshes, ponds, lakes and reservoirs.

- Carrier Volume and Spray Pressure: When used as part of a burndown weed control program, apply Cobra Herbicide in 7 to 10 gals of water per acre. Application at less than 7 gals per acre may provide inadequate control. When used for preemergence weed control, apply Cobra Herbicide in 5 to 10 gals of water per acre. The higher gallonage applications generally afford more consistent weed control. Do not exceed the nozzle manufacturer’s recommended pressures. For many nozzle types, lower pressure produces larger droplets. When higher flow rates are needed, use higher flow rate nozzles instead of increasing pressure.

- Nozzle Selection and Orientation: Formation of very small drops may be minimized by appropriate nozzle selection, by orienting nozzles away from the air stream as much as possible and by avoiding excessive spray pressure. Use nozzles that produce flat or hollow cone spray patterns. Use non-drip type nozzles, such as diaphragm type nozzles, to avoid unwanted discharge of spray solution. The nozzles must be directed toward the rear of the aircraft, at an angle between 0 and 15° downward. Do not place nozzles on the outer 25% of the wings or rotors.

Adjuvants and Drift Control Additives: Drift control additives are not recommended with Cobra Herbicide.


Do not cultivate prior to or during application. Do not generate excessive dust while spraying. Excessively dusty conditions may interfere with the coverage of the weed leaf surface by the spray solution. A timely cultivation approximately one week after application will assist in weed control.


A sequential application of Cobra Herbicide can be made after a minimum of 14 days have passed following the first application.


If the crop treated with Cobra Herbicide is lost due to a catastrophe, such as hail or other forms of inclement weather, refer to crop Rotational Restrictions below.


Cobra Herbicide has no rotational restrictions.

Limitations, Restrictions, and Exceptions


Cobra Herbicide may be applied as a post-directed or layby application for postemergence weed control.

- Do not apply more than 12.5 fl oz/A (0.20 lb ai/A) of Cobra Herbicide per application.
- Do not exceed a combined rate of 25 fl oz/A (0.40 lb ai/A) of Cobra Herbicide per season.
- Do not make a sequential application of Cobra Herbicide within 14 days of the first application.
- Do not make more than two (2) Cobra Herbicide applications per season.
- Do not apply Cobra Herbicide to cotton within 70 days before harvest.
- Do not graze animals on green forage or stubble.
- Do not utilize hay or straw for animal feed or bedding.
- Do not apply Cobra Herbicide over the top of cotton.


Apply Cobra Herbicide postemergence as a directed spray application following a preplant incorporated or preemergence herbicide(s) for early season control of grasses and broadleaf weeds. Use Cobra Herbicide as a postemergence directed application when the cotton plant has reached a minimum height of 6 inches and a height difference of 3 to 5 inches has been established between the lower leaves of the cotton plant and the top of the broadleaf weeds.

Layby applications of Cobra Herbicide will control broadleaf weeds that do not exceed leaf stage recommendations listed in Table 2 of this label. Refer to the label section on TANK MIX PARTNERS FOR USE IN COTTON for specific recommendations. Use of a crop oil concentrate or a non-ionic surfactant is required. Refer to the label section on ADJUVANTS AND ADDITIVES for specific recommendation.

Apply Cobra Herbicide to cotton ONLY as a DIRECTED SPRAY application with nozzles set to deliver the spray mixture toward the base of the cotton plant, as specified in the “Timing” and “Application” sections of this label. Lower leaves which are contacted by the spray mixture will appear spotted or light brown to bronze in color. This response will have no effect on the growth or development of the cotton crop, and all growth following application will be normal. It is essential to establish a height differential of 3 to 5 inches between the crop and the target weeds prior to application to ensure full coverage of the weed leaf surfaces while minimizing direct contact of the spray mixture with the upper leaves and terminal area of the cotton plant.

Cobra Herbicide is a contact herbicide. It does not move throughout the cotton plant and it will not vaporize off the soil surface.


Post-Directed: Cotton 6” or more – For best results, Cobra Herbicide should be applied to small, actively growing weeds. Nozzle should be set to spray no higher than the bottom 2 to 3 inches of the cotton talk (or the top of the bark formation) and still fully cover the target weeds. A properly timed directed spray application will provide control of labeled weeds not larger than indicated in Table 2.

Layby: Cotton 12” or more – Nozzles should be set to spray no higher than the bottom 1/3 of the cotton stalk (up to the first fruiting node) and still fully cover the target weeds. Use of tank mix combinations will provide better control of larger late season troublesome weeds in cotton.

When postemergence directing Cobra Herbicide at the same time as cultivation, the spray nozzles must be positioned in front of the cultivation equipment. Applying Cobra Herbicide at the time of cultivation under dry soil conditions will cause excessive dust which will prevent proper contact between Cobra Herbicide and the weed surface. This reduced contact will decrease weed control activity. In addition, applying Cobra Herbicide while cultivating at ground speeds greater than 5 mph will prevent good coverage of the weed surface by the spray solution and reduce weed control activity.


Cobra Herbicide Applied Alone: Apply Cobra Herbicide at a rate of 12.5 fl oz per acre on a broadcast basis. The sprayer must be equipped with flat fan or off-center fan nozzles designed to deliver 10 to 30 gals of water per acre when operated at a spray pressure of 20 to 30 PSI measured at the nozzle. Pressures greater than 30 PSI may cause the spray mist to move upward into the cotton canopy resulting in severe crop injury.


The use of recommended adjuvants has consistently enhanced weed control over a wide range of application conditions.

For post-directed application of Cobra Herbicide to cotton at least 6” tall, use either a non-ionic surfactant at 0.25% v/v; OR crop oil concentrate at 1 pt per acre (broadcast basis), if bark formation has begun. For Layby application of Cobra Herbicide to cotton 12” tall (or more), use a crop oil concentrate at 1 to 2 pts per acre (broadcast basis).

Pre-Harvest Interval

70 days

Restricted Entry Interval

12 hours